So from what I understand they are saying landlord's should not enforce rules regarding unauthorized occupants, subletting, work on the property without conscent, noise complaints or general misconduct. 

Now the unit above the "garage" has to listen to the noise. 

So, I dealt swiftly with noise problems. 

I am not sure how they enforce this (the city inspector asked during my latest inspection, but I only had people in my 4 bed unit so it wasn't an issue) I have discovered that the neighbors snitch, because of parking, noise, trash, etc. - even when you are within the permitted number of unrelated occupants :)

If they continue to make noise, even though they've been warned, they get kicked out. 

Look at it as if your neighbor called an AC company because your unit was making too much noise by their window and the company fixed it - would that be your bill?

You now have to live with another person in your house (extra car, more noise, more depreciation, possible drama, etc).

As soon as this couple put both of their Bose Noise Canceling headphones on, I was hooked. 

There may be issues with noise and odors.

.- Keep noise at dinner conversation levels and do not play loud music at any time.